Abstract-Superradiant Terahertz Emission by Dipolaritons

O. Kyriienko1,2, A. V. Kavokin3,4, and I. A. Shelykh1,2 

http://prl.aps.org/abstract/PRL/v111/i17/e176401

1Science Institute, University of Iceland, Dunhagi-3, IS-107 Reykjavik, Iceland
2Division of Physics and Applied Physics, Nanyang Technological University, 637371 Singapore
3School of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
4Spin Optics Laboratory, St. Petersburg State University, Building 1, Ulianovskaya Street, St. Petersburg 198504, Russia

Received 4 November 2012; revised 17 June 2013; published 22 October 2013

Dipolaritons are mixed light-matter quasiparticles formed in double quantum wells embedded in microcavities. Because of resonant coupling between direct and indirect excitons via electronic tunneling, dipolaritons possess large dipole moments. Resonant excitation of the cavity mode by a short pulse of light induces oscillations of the indirect exciton density with a characteristic frequency of Rabi flopping. This results in oscillations of a classical Hertz dipole array which generate supperradiant emission on a terahertz (THz) frequency. The resulting THz signal may be enhanced using the supplementary THz cavity in the weak coupling regime.

© 2013 American Physical Society